Table 5.

Amount in mg of amoxicillin in the tested weighed pill

Medicine	Mass of unknown sample	Mass of amoxicillin per pill	Mean amount of amoxicillin (in mg)	SD(a)	RSD(b) (%)	Relative deviation© (%)	USP requirement
Drug1.1	1478.1	986.3631	969.46	15.39	1.58	10.79	90–120%
Drug1.2	1451.1	965.7939
Drug1.3	1471.8	956.2252
Drug2.1	1477.9	969.4269	983.60	12.97	1.31	12.41	90–120%
Drug2.2	1544.8	986.4853
Drug2.3	1548.8	994.8977
Drug3.1	1463.0	926.9293	952.01	28.73	3.01	8.80	90–120%
Drug3.2	1459.1	945.758
Drug3.3	1474.1	983.3707
Drug4.1	1501.6	1001.293	1003.43	6.30	0.62	14.67	90–120%
Drug4.2	1501.3	998.4876
Drug4.3	1512.2	1010.529
Drug5.1	1513.3	978.5518	985.95	6.49	0.65	12.68	90–120%
Drug5.2	1519	990.6797
Drug5.3	1532.6	988.6453

a: SD = $\sqrt{\frac{\sum \left(x-\overline{x}\right)}{n}}$ b: RSD = $\frac{\mathit{SD}}{\overline{X}}\times 100$ c: RD = $\frac{\mathit{\text{experimental}}-\mathit{\text{expected}}}{\mathit{\text{expected}}}$